运用三维变密度潮汐效应模型确定滨海含水系统的海底等效边界——山东烟台夹河中下游地区为例

成建梅; 陈崇希; 吉孟瑞; 孙桂明

运用三维变密度潮汐效应模型确定滨海含水系统的海底等效边界——山东烟台夹河中下游地区为例

1.
中国地质大学环境地质研究所, 湖北武汉 430074
2.
山东省第三地质队地质工程勘察院, 山东烟台 264000

基金项目:

国家自然科学基金资助项目 49872081

详细信息

作者简介:
成建梅(1971-), 女, 副教授, 博士, 主要从事地下水流动及污染数值模拟技术研究

中图分类号: X141
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- 被引次数: 0
出版历程
- 收稿日期: 2001-09-29
- 刊出日期: 2003-03-25

Determination of Seaward Boundary with Three-Dimensional Density-Dependent Tidal Effect Model: By Example of Coastal Aquifers in Jiahe River Basin, Shandong Province

1.
Institute of Environmental Geology, China University of Geosciences, Wuhan 430074, China
2.
Institute of Geotechnique Survey, The Third Geology Pioneer of Shangdong Province, Yantai 264000, China

摘要

摘要: 确定咸淡水界面的位置是滨海地区海水入侵研究的主要任务之一.对于天然条件承压含水层而言, 含水层顶板向海底延伸的距离直接影响了咸淡水界面的位置, 它可以通过承压含水层中地下水的潮汐效应信息来确定.考虑到咸淡水之间密度的差异, 建立了山东省夹河中下游地区滨海含水系统地下水三维变密度潮汐效应模型.通过反复对比潮汐效应观测中的地下水水头波动与模型计算出的水头波动, 确定了滨海承压含水系统的海底边界.同时, 也初步估计出海区与近海陆区含水层的水文地质参数.
- 地下水潮汐效应 /
- 变密度 /
- 海底边界 /
- 三维数值模型
Abstract: One of the main tasks in studying saltwater intrusion into coastal aquifer system is to determine the position of the saltwater-freshwater interface. For a natural confined aquifer, this position is related to the roof length of the aquifer extending under the sea. This information can be obtained from fluctuations of confined groundwater level caused by tidal effect of the sea. In the paper, taking account to the density difference between freshwater and seawater, a three-dimensional density-dependent tidal-effect model is developed in the Jiahe River basin, Shandong Province, China. The position of the aquifer roof extending under the sea, which is called the equivalent boundary toward sea, is determined by converging hydraulic head fluctuations data observed in the tidal-effect observation experiment. The aquifer parameters near the sea side are also estimated according to tidal fluctuation information.
- tidal effect of groundwater /
- variable-density /
- seaward boundary /
- three-dimensional model

HTML全文

图 1 地下水海底排泄方式

a.线性集中排泄方式; b.面状越流排泄方式

Fig. 1. Drainage patterns

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图 2 夹河中下游地区综合平面图

Fig. 2. Schematical map in the Jiahe river

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图 3 夹河中下游地区纵向地质剖面

1.砂砾石; 2.细砂; 3.中粗砂; 4.亚砂土; 5.粉质粘土; 6.淤泥及淤泥质粉土

Fig. 3. Geological section from the Yellow Sea to Yushuzhuang in the Jiahe river

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图 4 潮汐效应观测拟合对比曲线

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图 5 感潮河段附近潮汐效应观测水头波动对比曲线

Fig. 5. Comparison of observed head fluctuation with calculated head fluctuation near the tidal reach

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